Thanks guys, the info is good to know. =)
Especially if there are those who have used frozen vacuum-sealed for over a year without a problem. Because I just bought a total of 65 rats and mice for the three of my guys. :| I think I bought these on a whim

Cake is currently 290g, so I feel he's still a LITTLE small for weaned rats at the moment. I just bought 25 jumbo mice for both Cake and Yukon (eventually) to eat, until Cake is up to size for possibly small rats... which would take a few months. So hopefully the small rats lasts in the vacuum-sealed bag they come in.